Add a standard constructor for dynamic classes

[nthiery]

This patch implements sage.structure.dynamic_class.dynamic_class, for constructing dynamically new python classes. The constructed classes can be pickled, and have unique representation.

The patch includes a discussion on the relevance of dynamic classes for Sage.

Depends on #5985 for pickling and #5120.

Used by the upcoming category framework #5891, (and sage-words?)

Issue: is sage.structure.dynamic_class.dynamic_class the natural location for this?

CC: @sagetrac-sage-combinat @saliola @roed314

Component: misc

Keywords: dynamic classes, unique representation

Author: Nicolas M. Thiéry

Reviewer: David Roe

Merged: sage-4.2.alpha0

Issue created by migration from https://trac.sagemath.org/ticket/5991

[nthiery]

Description changed:

--- 
+++ 
@@ -1,5 +1,11 @@
 This patch implements sage.structure.dynamic_class.dynamic_class, for constructing dynamically new python classes. The constructed classes can be pickled, and have unique representation.
 
-Depends on #5985 for the pickling and #5120
+The patch includes a discussion on the relevance of dynamic classes for Sage.
+
+Depends on #5985 for the pickling and #5120.
 
 Used by the upcoming category framework #5891, (and sage-words?)
+
+Issue: is sage.structure.dynamic_class.dynamic_class the natural location for this?
+
+(please ignore dynamic_class-5991-submitted.2.patch; Michael: you may remove it)

[nthiery]

Description changed:

--- 
+++ 
@@ -2,7 +2,7 @@
 
 The patch includes a discussion on the relevance of dynamic classes for Sage.
 
-Depends on #5985 for the pickling and #5120.
+Depends on #5985 for pickling and #5120.
 
 Used by the upcoming category framework #5891, (and sage-words?)
 

[nthiery]

comment:4

Patch updated for new version of #5120
Please ignore dynamic_class-5991-submitted.2.patch

[robertwb]

Description changed:

--- 
+++ 
@@ -8,4 +8,3 @@
 
 Issue: is sage.structure.dynamic_class.dynamic_class the natural location for this?
 
-(please ignore dynamic_class-5991-submitted.2.patch; Michael: you may remove it)

[nthiery]

Attachment: dynamic_class-5991-submitted.patch.gz

[roed314]

comment:7

Looks good. Doctests pass.